Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
van hanh » van thanh, ban hanh, van anh
te sach » toc sach
sach ky » sac ky, sach y, sach ty
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu va » hieu qua
su viet » so viet

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang xa hoi. ((hieu va) OR (lieu va)) cam xuc ((va thanh) or (van hanh)) va su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang xa hoi. ((hieu va) OR (lieu va)) cam xuc ((va thanh) OR (van hanh)) va su viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang xa hoi. ((hieu va) OR (lieu va)) cam xuc ((va thanh) or (van hanh)) va su viet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang xa hoi. ((hieu va) OR (lieu va)) cam xuc ((va thanh) or (van hanh)) va su viet*.